Web-replenishing means



Sept. 12,' 1939. w. c. SCOTT 2,172,775

' WEB-REPLENISHING MEANS Filed July '24, 1936 2 Sheets-Sheet 1 INVENTOR ATT'ORNEY Sept. 12,. 1939. w. cf SCOTT WEB-iiEPLENISI-IING MEANS Filed July 24, 1936 2 Sheets-Sheet. 2

INVENTOR I Walfer 6' Staff M641 ATTORNEY Patented Sept; 12, 1939 iJNlTED- srarss PATENT QFFICE WEB-REPLENISHING MEANS Walter 0. Scott, Plainfleld, N.- J.

Application July 24,1936, Serial No. 92,293

1 Claim.

10 been employed in the prior art to bring this,

about.

One of these methods consists in bringing the replenishing roll into engagement with the running web and driving the roll by frictional con- 15 tact with said running web, the disadvantage of which will be understood from the following: The leading end of the web of the replenishing roll is covered "with an adhesive by means of which the webs are to be united, and it is therefore necessary 'to engage the roll with the web directly after the pasted portion on the leading end of the roll has passed by the running web. But asthe roll has to be brought up to approximate uniting speed by the time the pasted portion of the roll again comes adjacent the running web it will be understood that said roll has to be accelerated from a state of rest to uniting I speed during what practically amounts to threequarters of a revolution of the roll. It is exceedw ingly cinema to accomplish this at full speed and it has therefore been found necessary to slow themachine down, but as the object of the socalled wing poster is to save time in making roll changes, the disadvantage of slowing down the machine is obvious.

Another method of uniting the webs, as heretoiore practiced, is to accelerate the replenishing roll to approximate uniting speed before said roll is brought into engagement with the running web, the acceleration being efiected either by belts or aprons engaging the surface of the replenishing roll or by'core-driving motors. By this second method the necessary acceleration of the replenishing roll is not restricted to three- 5 quarter-sot a revolution because, obviously, the replening roll can be rotatedmore than one complete revolution, or as many revolutions as may be desired, before the webs are united, as the roll is not in contact with the dng web.

There are, however, disadvantages associated g paper, vary in diameter and it is therefore necessary to employ rather elaborate and expensive coordinating means to compensate for such variations.

The main object and feature of this invention is to provide a method and means to overcome 5 the difliculties' outlined above. I proposeto accelerate the replenishing roll by driving it from the running web, thereby assuring speed coordination, and to drive the roll from the running web for more than one revolution of the 10 "roll if desired before uniting the webs, thereby affording suiildient time to properly accelerate the roll and thus enabling the roll change to be efiected at high speeds.

In the'exemplification of the inventionherein l5 disclosed this is accomplished by shielding the body of adhesive of the roll during initialrotation of the roll so as to prevent thewebs from uniting, and thereafter'exposing the body of adhesive so as to unite the webs.

In the accompanying drawings the invention is disclosed in several forms in which:

Fig. 1 is a view partly in side elevation and partiy'in section of a web replenishing mechanism embodying one form of the invention;

Fig. 2 is a perspective view of aportion of the replenishing roll shown in Fig. 1;

Fig. 3 is a view of the replenishing roll looking in the direction of arrow 3 of Fig. 1;

Fig. i is a sectional view substantially on the g plane of line il of Fig. 5 showing a modification of the invention;

Fig. 5 is a view partly in elevation and partly in section of one end ofthe replenishing roll shown in Fig. i. g5

Referring first to the form of the invention shown in Figs. 1 to 3 inclusive, l indicates the conventional rotatable reel carrying, in this instance, three web rolls, the roll 2 being the active roll from which'flows web W to the printing {w or other machine in a manner well understood.

3 indicates the replenishing roll, and t is a reserve roll that eventualy becomes a replenishing roll and then the active roll. The leading end of the replenishing roll, as is customary, is held as against the body of the roll or the adjacent convolution thereof by a suitable bond which may be for instance a body of grease or, as here shown, a number of frangible tabs 5. The leading end of the web of the replenishing roll is 50 further provided with a body of adhesive 6 which maybe continuous or interrupted lengthwise of the roll.

Suitable means to shield the body of adhesive is provided, said means forming part oi a transas mission device to drive the replenishing roll from the running web or from a running belt located in rear of the running web. In the instant form of the invention, the-shield consists of a curved member 26 of sheet material that straddles the body of adhesive, and said member 26 may be hollowed out on its inside as at 21 so as not to touch said body of adhesive. Suitable means to hold the shield in position are provided consisting here of frangible tabs 28. 29 indicates a plurality of knives that are normally held in a retracted position by springs 30, and 3| are solenoids that when energized project the knives and sever frangible tabs 28. 32 indicate bracketsfor guiding the shield out of the machine.

When a roll change is to be efiected, the spider is turned to bring the replenishing roll into the position shown in Fig. 1. As the shield is at this time in a position covering adhesive 6, it will be understood that said shield will engage the running web and will at the same time prevent the body of adhesive 6 from engaging said running web and consequently the webs will not be united. The replenishing roll can make as many' complete revolutions as may be desired to bring it up to approximate uniting speed and the shield can therefore be brought gradually into engagement with the running web so as to avoid undue shock. When suflicient speed has been attained, solenoids 3| are energized, thereby severing tabs 28 and centrifugal force flings theshield away from the roll, thereby enabling the .body of adhesive 6 on the replenishing roll to engage the running web so that the-webs are united and temporary bond 5 is released. The old running web can now be severed, and the spider can again be moved to bring the re- 4 and 5, the chucks of the replenishing roll carry disks 33 of smaller diameter than the roll of paper. These disks carry brackets or supports 34 adjustable by means of set screws 3! and slots 36. Extending between brackets 34 at opposite ends of the roll is a shield 31 here of frangible material to cover the body 01' adhesive material on the roll. After the replenishing roll has been brought up to proper speed, solenoids 38 carried by'the spider are energized thereby projecting knives 39 and severing the shield. Springs 40 move the knives upwardly when sole-' noids 3B are deenergized.

I claim:

A web replenishing mechanism, in which a replenishing roll, having a body of adhesive on its leading end, is to be united with a running web, including means to move the replenishing roll toward the running web; shielding means to prevent the body of adhesive from engaging with the running web; elements to hold said shielding means in position to rotate with the roll, and inechanismoperatable duringrotation of the roll to sever the elements that hold the shield in position to thereby admit of removal of the shielding means. 

